\Header{genotype}{Rat Genotype Data}
\keyword{datasets}{genotype}
\begin{Description}\relax
Data from a foster feeding experiment with rat mothers and litters of
four different genotypes: \code{A}, \code{B}, \code{I} and \code{J}.  Rice litters were
separated from their natural mothers at birth and given to foster
mothers to rear.\end{Description}
\begin{Usage}
\begin{verbatim}
data(genotype)
\end{verbatim}
\end{Usage}
\begin{Format}\relax
The data frame has the following components:
\describe{
\item[\code{Litter}] The genotype of the litter

\item[\code{Mother}] The genotype of the foster mother

\item[\code{Wt}] Litter average weight gain of the litter, in grams at age 28 days.
(The source states that the within-litter variability is negligible.)
}\end{Format}
\begin{Source}\relax
Scheffe, H. (1959)
\emph{The Analysis of Variance}
Wiley p. 140.

Bailey, D. W. (1953)
\emph{The Inheritance of Maternal Influences on the Growth of the Rat.}
Unpublished Ph.D. thesis, University of California. Table B of the Appendix.\end{Source}
\begin{References}\relax
Venables, W. N. and Ripley, B. D. (1999)
\emph{Modern Applied Statistics with S-PLUS.} Third
Edition. Springer.\end{References}

